X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/dd4daa8a2ba4986a2fc9bba17251f6955f2332b8..c2ef5d7e9fc09693770d5d89a6913b47b9d6dbe7:/doc/doc-docbook/spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index e2111554c..7b92a2f21 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -42171,6 +42171,9 @@ There is no need to periodically change this key; a timestamp is also
 encoded.
 The second argument should be given as the envelope sender address before this
 encoding operation.
+.new
+If this value is empty the the expansion result will be empty.
+.wen
 The third argument should be the recipient domain of the message when
 it arrived at this system.
 .endlist